Yep, most of the weight is on the rear, so it won't "roll over" glass without picking it up like the front might. And it's easier to steer around/hop over debris with the front as well, so it's much less likely to flat (most of the time, if you steer around something with the front, the rear rolls right through it as it runs on tighter line in corners).
So rear liner is my compromise between weight and puncture resistance (or it was, 'cos I use my Vittoria Rubinos sans belt on the road bike)